I stumbled across this amazing map created in 1869 by the groundbreaking cartographer
Charles Joseph Minard - Wikipedia (EN). The map displays in graphic form the decimation of Napoleons's
Grande Armee during
Napoleon's Invasion of Russia - Wikipedia (EN). The army starts out with over 400,000 soldiers and return with just 10,000 men by the time they return to the River Niemen.

According to Wikipedia: "Charles Minard's 1869 chart showing the losses in men, their movements, and the temperature of Napoleon's 1812 Russian campaign."
The map is called
Carte figurative des pertes successives en hommes de l'Armée Française dans la campagne de Russie 1812-1813.The map is perhaps the most effective graphic display of information I've ever encountered.
This link takes you to animated display of the map.
http://www.gemura.com/page/en/minard/minardmapThis link takes you to a clickable version.
http://www.ddg.com/LIS/InfoDesignF96/KScott/map.html